Syntin
| Names | |
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| Preferred IUPAC name
21-Methyl-11,21:22,31-tercyclopropane | |
| Other names
1-Methyl-1,2-dicyclopropylcyclopropane; Sintin; Synthin; Tsycklin; Tsiklin
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| Identifiers | |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| C10H16 | |
| Molar mass | 136.238 g·mol−1 |
| Density | 0.851 g/mL |
| Boiling point | 158 °C (316 °F; 431 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Syntin is a hydrocarbon with the molecular formula C10H16 used as a rocket fuel. It is a mixture of four stereoisomers (see below). It has a density of 0.851 g/mL, and a boiling point of 158 °C. Due to the presence of three strained cyclopropane rings, the molecule has a highly positive enthalpy of formation: ΔfH°(l)= 133 kJ/mol (980 kJ/kg, the average value for the isomeric mixture),[1] bringing additional energy into the combustion process. It has advantages over the traditional hydrocarbon fuels, such as RP-1, due to higher density, lower viscosity and higher specific heat of oxidation.
Syntin was used in the Soviet Union and later Russia as fuel for the Soyuz-U2 rocket from 1982 until 1995.[2][3]
It was first synthesized in the USSR in 1959[1] and brought to mass production in the 1970s. It was prepared in a multi-step synthetic process from easily obtained acetylcyclopropane (the 3rd molecule):
Syntin synthesis 01
After dissolution of the USSR, the production of this fuel was halted due to the expense of the synthesis. On September 3, 1995, Soyuz TM-22, the seventy-first and last Soyuz-U2 rocket launched, being the last rocket fueled with Syntin.[3]
Stereoisomers
[edit | edit source]Syntin has two stereocenters at the central cyclopropane ring. Thus, four stereoisomers exist:
Four Syntin Stereoisomers
In practice, syntin is used as a racemic mixture (a mixture where all stereoisomers are present in equal amounts).
See also
[edit | edit source]References
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Literature
[edit | edit source]- A. P. Mesheheryakov, V. G. Glukhovtsev, A. D. Petrov, "Synthesis of 1-methyl-1,2-dicyclopropylcyclopropane", Doklady Akademii Nauk SSSR, 1960, 130, 779–81.
- Yu. P. Semenov, B. A. Sokolov, S. P. Chernykh, A. A. Grigor'ev, O. M. Nefedov, N. N. Istomin, G. M. Shirshov, "Multiple strained-ring alkane as high-performance liquid rocket fuel", RU 2233385, C2 20040727.
- T. Edwards, "Liquid Fuels and Propellants for Aerospace Propulsion: 1903-2003", Journal of Propulsion and Power, 2003, 19(6), 1089–1107. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- V. Azov, D. Vorontsov, "The last battle of hydrocarbons?", Novosti Kosmonavtiki, 2008, 18, No. 2 (301), 44–46.